<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>菜鸟尝试</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@3.4.5/dist/vue.global.min.js"></script>
</head>
<body>
    <div id="app">
        <h2 @click="clickCallback">{{msg}}</h2>
        <button >{{fn}}</button>
    </div>

    <script>
        export default{
            data(){
                return{

                }
            }
            
    }

    </script>
</body>
</html>